import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
//1.引入element-plus组件库与其样式
import ElementPlus, {ElMessage} from 'element-plus'
import 'element-plus/dist/index.css'
//2.引入element-plus图标库,并起别名为ElementPlusIconsVue
import * as ElementPlusIconsVue from '@element-plus/icons-vue'
//6.1修改elementPlus默认中文
import zhCn from 'element-plus/dist/locale/zh-cn.mjs'
import axios from "axios";
//9.1 配置后端服务器根路径
const BASE_URL = 'http://localhost:8080';
//9.2 window对象是浏览器内置的全局对象,给它添加的属性就是全局属性,可以在任意组件的script标签中使用!
window.BASE_URL = BASE_URL;

const app = createApp(App)/* 创建vue实例,并起名为app */
app.config.globalProperties.BASE_URL = BASE_URL;
//3.将所有导入的图标组件变为键值对数组,并依次遍历取出每一个图标组件[key, component]
for (const [key, component] of Object.entries(ElementPlusIconsVue)) {
    // 4.将当前遍历到的图标组件注册为当前vue实例的全局组件
    app.component(key, component)
}
//5.为前vue实例应用element-plus组件库
//6.2 app.use(ElementPlus,{ locale: zhCn })将El本地化为中文
app.use(ElementPlus,{ locale: zhCn }).use(store).use(router).mount('#app')

//7.解决ResizeObserver Error
const debounce = (fn, delay) => {
    let timer = null;
    return function () {
        let context = this;
        let args = arguments;
        clearTimeout(timer);
        timer = setTimeout(function () {
            fn.apply(context, args);
        }, delay);
    }
}
const _ResizeObserver = window.ResizeObserver;
window.ResizeObserver = class ResizeObserver extends _ResizeObserver {
    constructor(callback) {
        callback = debounce(callback, 16);
        super(callback);
    }
}

//8.路由导航守卫
//to 指的是即将要进入的路由
//from 指的是即将要离开的路由
//next 放行函数
router.beforeEach((to, from, next) =>{
    //获取当前登录的数据
    let user = localStorage.user;//localStorage.clear();临时清空所有存储的数据
    //如果当前访问的不是登录页面且当前用户未登录
    if(to.path!=='/login'&&!user){
        //跳转到登录页面，并提示用户登录
        next({ path: '/login'},ElMessage.error('请先登录'));
    }else{
        //放行
        next();
    }
})

//10.获取当前登录人的数据
window.getUser= () =>{
    return localStorage.user ? JSON.parse(localStorage.user) : null;
}

//11.创建根据字典code加载其对应所有字典项的全局方法
window.loadDictOptions =  (object,dictCode) => {
    axios.get(BASE_URL+'/v1/dictoption/select/'+dictCode).then((response)=>{
        if(response.data.code===2000){
            object.value = response.data.data;
        }else{
            ElMessage.error(response.data.message);
        }
    })
}